Agilent Technologies 35670-90066 manual G• Attach the logic probe to A7 P7 pin 1 SDA

Models: 35670-90066

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G• Attach the logic probe to A7 P7 pin 1 (SDA).

Agilent 35670A

Troubleshooting the Analyzer

 

To troubleshoot IIC bus failures

If the signal does not toggle after SW2 is pressed, the A7 CPU assembly is probably faulty.

If no error messages are displayed after Booting System or A7 DS101 (green run LED) is off, go to page 4-29,‘’To troubleshoot fast bus failures.’’

Step 3. Check the serial data line (SDA).

GAttach the logic probe to A7 P7 pin 1 (SDA).

Press SW2 while monitoring A7 P7 pin 1 (SDA), the power-on LEDs, and the display.The TTL logic level should toggle when 00 is displayed and toggle continuouslywhen Booting System is displayed. The following failure message should bedisplayed after Booting System and the display grid should appear about 2 minutesafter power up.Front Panel failure information:

keyboard IIC chip fails:

IIC: No Device Acknowledge

key stuck: 32

A power-on test has failed. Refer servicing to qualified personnel.

Press Start key to attempt to continue power-up.

If the signal does not toggle after SW2 is pressed or the failure message is not displayed, the A7 CPU assembly is probably faulty.

4-27

Page 203
Image 203
Agilent Technologies 35670-90066 manual G• Attach the logic probe to A7 P7 pin 1 SDA